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SAE-AISI 1140 Steel vs. ASTM Grade HI Steel

Both SAE-AISI 1140 steel and ASTM grade HI steel are iron alloys. They have 55% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
11
Fatigue Strength, MPa 230 to 370
150
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 600 to 700
550
Tensile Strength: Yield (Proof), MPa 340 to 570
270

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 51
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
23
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
4.1
Embodied Energy, MJ/kg 18
59
Embodied Water, L/kg 46
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
52
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
20
Strength to Weight: Bending, points 20 to 22
19
Thermal Diffusivity, mm2/s 14
3.9
Thermal Shock Resistance, points 18 to 21
12

Alloy Composition

Carbon (C), % 0.37 to 0.44
0.2 to 0.5
Chromium (Cr), % 0
26 to 30
Iron (Fe), % 98.4 to 98.9
46.9 to 59.8
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
14 to 18
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0.080 to 0.13
0 to 0.040